Hyaluronic acid is one of the most searched skincare ingredients on the planet — and for good reason. It is a humectant capable of holding up to 1,000 times its weight in water, making it a cornerstone of hydration-focused formulations. But despite its popularity in finished products, many DIY formulators and small skincare businesses are surprised by how straightforward it is to work with from scratch.
This guide covers everything you need to formulate a lightweight, professional-grade hyaluronic acid serum: what hyaluronic acid actually is and how it works, the difference between molecular weights, usage rates, compatible ingredients, a complete step-by-step recipe, and a troubleshooting section for the most common problems formulators encounter. All ingredients referenced are available in cosmetic grade from The Skin Science Company, with fast 2–3 day dispatch across Australia.
What Is Hyaluronic Acid?
Hyaluronic acid (HA) — INCI: Sodium Hyaluronate — is a glycosaminoglycan, a type of polysaccharide (sugar molecule) that occurs naturally in the body. It is found in high concentrations in the skin, connective tissue, and eyes, where it plays a critical role in maintaining moisture and structural integrity. In the skin specifically, HA is a key component of the extracellular matrix, the scaffolding that keeps skin plump, elastic, and hydrated.
In cosmetic formulation, hyaluronic acid is used as a humectant — an ingredient that attracts and binds water molecules from the environment and from deeper skin layers, drawing them to the surface. This is distinct from an emollient (which softens and smooths the skin surface) or an occlusive (which forms a physical barrier to prevent water loss). HA works best in a layered formulation system: applied to damp skin, followed by an emollient or occlusive to seal in the moisture it has attracted.
The cosmetic-grade ingredient used in formulation is almost always Sodium Hyaluronate — the sodium salt form of hyaluronic acid. It is more stable, more water-soluble, and easier to work with than free hyaluronic acid, and it is what SSC stocks as Hyaluronic Acid.
High vs. Low Molecular Weight: Does It Matter?
Molecular weight is one of the most discussed — and most misunderstood — aspects of hyaluronic acid in formulation. The theory is that lower molecular weight HA penetrates deeper into the skin, while higher molecular weight HA sits on the surface and provides a film-forming, plumping effect. In practice, the distinction is real but often overstated in consumer marketing.
For most DIY and small-batch formulators, high molecular weight Sodium Hyaluronate (the standard cosmetic grade) is the correct starting point. It is effective, well-studied, easy to work with, and produces a noticeably smooth, hydrated skin feel. Low molecular weight HA is available and can be blended with standard HA for a multi-depth hydration claim, but it is not necessary for an effective formulation.
| Type | Molecular Weight | Where It Works | Skin Feel | Best For |
|---|---|---|---|---|
| High MW Sodium Hyaluronate | 1,000–1,800 kDa | Surface / upper epidermis | Smooth, plumping, film-forming | Standard serums, most formulations |
| Low MW Sodium Hyaluronate | 5–50 kDa | Deeper epidermal layers | Lighter, less film-forming | Multi-weight blends, advanced serums |
| Hydrolysed Hyaluronic Acid | <10 kDa | Very superficial penetration | Very light, no film | Lightweight mists, toners |
Formulation Quick-Reference
Before writing a formula, these are the key parameters to know:
| Property | Value / Range | Formulation Note |
|---|---|---|
| INCI Name | Sodium Hyaluronate | Use on product labels and SDS |
| Solubility | Water-soluble only | Dissolves in the water phase; does not disperse in oils |
| Typical Usage Rate | 0.1–2% (standard); up to 3% (high-concentration) | Above 2%, texture becomes sticky and stringy — not desirable |
| Optimal pH | 4.5–7.0 | Stable across a wide pH range; most serums target pH 5.0–6.5 |
| Appearance | White to off-white powder | Dissolves to a clear, slightly viscous solution |
| Shelf Life (raw material) | 2–3 years (sealed, cool, dry) | Very stable as a dry powder; finished formulations require a preservative |
| Compatibility | Broad — compatible with most actives | Avoid high salt (electrolyte) concentrations, which can cause precipitation |
| Heat Stability | Moderate — dissolve at room temperature or below 40°C | Do not heat above 40°C; add to cool-down phase in heated formulations |
How to Dissolve Hyaluronic Acid Powder Correctly
This is where most beginners run into trouble. Hyaluronic acid powder does not dissolve instantly — it needs time and the right technique. If you add the powder directly to water and stir, you will get clumps and a lumpy gel that is very difficult to break down.
The correct method is to pre-disperse the powder in glycerin before adding water. Because glycerin is a viscous liquid that coats each HA particle, it prevents the particles from clumping together when they contact water. Here is the process:
- Weigh your Hyaluronic Acid powder into a small clean container.
- Add an equal or double weight of Glycerin and mix thoroughly until the powder is fully coated — you will have a thick paste.
- Add this paste to your water phase (distilled water, aloe vera gel, or floral water) and stir gently.
- Allow to hydrate for 20–30 minutes at room temperature, stirring occasionally. The solution will become clear and slightly viscous.
- Do not heat. Add remaining ingredients once fully dissolved.
What to Pair With Hyaluronic Acid
Hyaluronic acid is one of the most compatible cosmetic actives available — it works well with almost everything. The following table covers the most effective pairings for a hydration-focused serum, all available from The Skin Science Company.
| Ingredient | Typical Usage Rate | Why It Works With HA | SSC Product |
|---|---|---|---|
| Glycerin | 3–5% | Second humectant layer; helps HA dissolve; adds slip | Glycerin |
| Aloe Vera Gel | 10–30% | Soothing base; adds natural viscosity; skin conditioning | Aloe Vera Gel |
| Chamomile Floral Water | Up to 100% of water phase | Replaces plain distilled water; adds soothing botanical character | Chamomile Floral Water |
| Lavender Floral Water | Up to 100% of water phase | Replaces distilled water; gentle scent; skin conditioning | Lavender Floral Water |
| Vitamin E Oil | 0.5–1% | Antioxidant; adds a small amount of emolliency to an otherwise water-based formula | Vitamin E Oil |
| Distilled Water | Make up to 100% | Pure water base; essential for a stable, uncontaminated formula | Distilled Water |
If you want a ready-made starting point rather than formulating from scratch, SSC also stocks a range of pre-formulated hyaluronic acid serums that can be used as a base or sold as-is: the Hyaluronic Acid Serum, the HA Serum + B5, the HA Serum + B3, and the HA Serum + Vitamin C.
Complete Recipe: Lightweight Hyaluronic Acid Serum (100 g Batch)
This recipe produces a lightweight, water-clear serum with a smooth, non-sticky finish. It is suitable for all skin types and can be used morning and evening under a moisturiser. The formula is designed to be simple enough for beginners while producing a result that is genuinely comparable to commercial serums.
| Phase | Ingredient | % | Weight (100 g) | Function |
|---|---|---|---|---|
| Phase A | Distilled Water | 66.5% | 66.5 g | Water phase base |
| Phase A | Aloe Vera Gel | 20% | 20 g | Soothing base; natural viscosity |
|
Phase B (pre-mix) |
Hyaluronic Acid (Sodium Hyaluronate) | 1% | 1 g | Primary humectant |
|
Phase B (pre-mix) |
Glycerin | 5% | 5 g | Humectant; HA dispersant |
|
Phase C (add last) |
Vitamin E Oil | 0.5% | 0.5 g | Antioxidant; minor emolliency |
|
Phase C (add last) |
Broad-spectrum preservative (e.g. Phenoxyethanol & Ethylhexylglycerin) | 1% | 1 g | Preservation — essential in all water-based formulations |
|
Phase C (add last) |
pH adjuster (citric acid solution or sodium hydroxide solution) as needed | q.s. | q.s. | Adjust to pH 5.5–6.0 |
| Total | ~100% | ~100 g |
Method
- Sanitise all equipment — beakers, spatulas, pipettes, and the final bottle — with 70% isopropyl alcohol. Allow to air dry.
- Prepare Phase B: Weigh the Hyaluronic Acid powder into a small container. Add the Glycerin and mix thoroughly until you have a smooth paste with no dry powder visible. Set aside.
- Combine Phase A: Weigh the Distilled Water and Aloe Vera Gel into your main beaker and stir to combine.
- Add Phase B to Phase A: Add the HA/Glycerin paste to the water phase. Stir gently and continuously for 2–3 minutes. Allow to hydrate at room temperature for 20–30 minutes, stirring occasionally, until the solution is clear and uniform.
- Add Phase C: Add the Vitamin E Oil and preservative. Stir to combine. Note: Vitamin E is oil-soluble — it will not fully dissolve in a water-based serum but will disperse as fine droplets, which is acceptable at this low concentration.
- Check and adjust pH to 5.5–6.0 using a calibrated pH meter. Add a small amount of citric acid solution (10% w/w) to lower pH, or sodium hydroxide solution (10% w/w) to raise it, a drop at a time.
- Transfer to bottle — a 100 ml amber glass or dark HDPE bottle with a pump or dropper is ideal. Label with batch date and ingredient list.
Shelf life: 3–6 months with a broad-spectrum preservative, stored away from direct sunlight. How to use: Apply 3–5 drops to clean, damp skin. Pat gently to absorb. Follow with a moisturiser to seal in hydration.
Troubleshooting Common Problems
| Problem | Likely Cause | Solution |
|---|---|---|
| Lumpy, stringy gel that won't dissolve | HA powder added directly to water without pre-dispersing in glycerin | Always pre-mix HA powder with glycerin first. If already clumped, blend with a stick blender on low speed — this can sometimes rescue the batch |
| Serum feels sticky on skin | HA percentage too high (above 1.5–2%), or glycerin percentage too high (above 5–7%) | Reduce HA to 0.5–1% and glycerin to 3–5%. Stickiness is a sign of over-concentration, not a sign the product is working better |
| Serum turns cloudy after adding preservative | Preservative incompatibility with HA at certain pH levels, or preservative added at too high a temperature | Ensure the formula is at room temperature before adding the preservative. Check the preservative's recommended pH range — some require pH below 6.0 |
| Serum smells off after 2–3 weeks | Insufficient preservative, or contamination during manufacture | Always include a broad-spectrum preservative at the manufacturer's recommended rate. Sanitise all equipment thoroughly. Never use tap water — always use distilled water |
| Serum feels drying rather than hydrating | Applied to dry skin in a low-humidity environment — HA draws moisture from the skin rather than the air | Apply to damp skin immediately after cleansing. Always follow with a moisturiser to seal in the moisture HA has attracted |
Frequently Asked Questions
What percentage of hyaluronic acid should I use in a serum?
For most serums, 0.5–1% Sodium Hyaluronate is the sweet spot. This produces a noticeable hydrating effect without the sticky, stringy texture that appears above 1.5–2%. Higher concentrations do not produce proportionally better results — they mainly increase cost and the likelihood of an unpleasant skin feel.
Does a hyaluronic acid serum need a preservative?
Yes, without exception. Any formulation that contains water is at risk of microbial contamination — including bacteria, yeast, and mould. Hyaluronic acid serums are almost entirely water-based, which makes preservation critical. A broad-spectrum preservative at the manufacturer's recommended usage rate is non-negotiable in any water-containing cosmetic product.
Can I use tap water instead of distilled water?
No. Tap water contains minerals, chlorine, and microorganisms that can destabilise your formula, interfere with pH, and compromise preservation. Always use cosmetic-grade distilled water in any water-based formulation.
Can I add hyaluronic acid to an oil-based serum?
No. Sodium Hyaluronate is water-soluble only and will not dissolve or disperse in an anhydrous (oil-based) formula. It must be used in the water phase of a formulation. If you want to add a humectant to an oil-based serum, consider using a small amount of glycerin (which can be used at low percentages in anhydrous formulas) or a water-in-oil emulsion system.
What is the difference between hyaluronic acid powder and a pre-made hyaluronic acid serum?
The raw powder gives you full control over concentration, pH, and what you pair it with — ideal if you are building a custom formulation from scratch. A pre-made serum base (like the SSC Hyaluronic Acid Serum) is already formulated, preserved, and pH-adjusted — ideal if you want to add your own actives or sell a finished product without the full formulation process.
Where to Buy Cosmetic-Grade Hyaluronic Acid in Australia
The Skin Science Company stocks cosmetic-grade Hyaluronic Acid (Sodium Hyaluronate) suitable for DIY formulation and small-batch production, with fast 2–3 day dispatch across Australia. We also stock all the supporting ingredients used in this recipe — Glycerin, Aloe Vera Gel, Distilled Water, and Vitamin E Oil.
If you would prefer a pre-formulated starting point, browse the full range of Hyaluronic Acid Serum bases — including versions with added B3, B5, and Vitamin C — available for private labelling or direct resale.
Shop Hyaluronic Acid → Shop All Raw Ingredients →
All products from The Skin Science Company are intended for cosmetic use only. Nothing in this article constitutes medical advice or makes therapeutic claims. Always patch-test new ingredients before incorporating them into a full formulation. Ensure all finished products are appropriately preserved and tested before sale.
